Predicted to enable serine-type endopeptidase inhibitor activity. Predicted to act upstream of or within negative regulation of peptidase activity. Predicted to be located in extracellular region. Is expressed in brain ventricular layer; ganglia; liver lobe; and olfactory epithelium. Orthologous to human SPINK4 (serine peptidase inhibitor Kazal type 4). [provided by Alliance of Genome Resources, Apr 2022]